Locus of Points / Envelope |
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![]() You can construct a locus of points or envelope from a selected point or line, by defining a range for some constraint in the drawing. Just follow these easy steps:
![]() 3. You need a parameter to drive the motion to create the locus. Click the arrow key to the right of the Parametric Variable window to select from a list of all variables in the drawing. (If you entered the needed constraint in real terms, Cancel the trace and change the constraint to a variable by double-clicking it in the drawing window.) ![]() 4. Simply fill in the values for the appropriate variable and click the Ok button. ![]()
To adjust the range of the locus, double-click the locus to edit the dialog. The following example shows an envelope of the line DE. We use the Point proportional along curve constraint and the parameter t to position the points D and E (D is (1-t) along line AC and E is t along line AB). In the Edit Locus dialog, we create the envelope from parameter t as it ranges from 0 to 1. ![]() You can replay the creation of the envelope with the Animation tools. Select variable t and click the Play button.
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